<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="/calc">
        <h1>计算器</h1>
        <input type="text" name="num1"> 
        <input name="symbol" type="radio" value="1"> +
        <input name="symbol" type="radio" value="2"> -
        <input name="symbol" type="radio" value="3"> *
        <input name="symbol" type="radio" value="4"> /
        <input type="text" name="num2"> 
        <input type="submit" value="=">
    </form>
    
</body>
</html>